Air cleaner and silencer



1951 J. E. PERRIN 2,564,814

AIR CLEANER AND SILENCER Filed Aug. 25, 1948 INVENTOR James Perrz n LUPQOM ATTORN EY Patented Aug. 21, 1951 AIR CLEANER AND SILENCER James E. Perrin, Toledo, Ohio, assignor to The De Vilbiss Company, Toledo, Ohio, a corporation of Ohio Application August 25, 1948, Serial No. 46,052

(ill. 183-73) 2 Claims. 1

This invention relates to an air cleaner and silencer for attachment to the air intake of an air compressor or internal combustion engine.

The principal object of the invention is the provision of such an article of simple and compact design.

Another important object is the provision of a cleaner and a silencer that is particularly effective in reducing the noise ordinarily escaping from the air inlet of compressors and engines.

These and other objects of the invention are attained through the use of a minimum number of parts and the positioning and shape of the silencing elements.

The device is composed of four main partsa cover, an annular filter, a partition, and a casing. In addition there is a stud and thumb nut which holds the parts in assembled relation In the drawing is a single view illustrating a vertical central section of an air cleaner and silencer embodying my invention.

As shown in the drawing the device has a lower casing l with a lateral air outlet 2 for connection to the air inlet of the compressor or engine to which it is attached. An internally extending flange 3 around the upper portion of the casing provides a seating surface for the arched partition 4. The latter is ported at its center with an annular upwardly turned lip 5 bordering the port. To the interior of the lip is permanently affixed a vertical tube 6 depending therefrom to near the bottom of the casing.

Upon the flat edge 1 of the partition rests the lower end of the cylindrical filter 8 composed of several layers of wire fabric. Closing the upper end of the filter is a top 9. From the bottom of the casing, to which it is threaded, a stud ill extends through the tube 5 and through the top A thumb nut H threaded to the exteriorly protruding end of the stud bears against the top with the stud holds the top, filter and casing together.

When in operation air is drawn through the filter and flows downwardly through the tube '3 into the casing and thence through the outlet 2.

While the theory of its functioning is not full understood, the simple arched partition with the centrally depending tube secures a silencing action more effective than that obtained with many of the devices used in the past involving a much more complicated arrangement of nested tubes and multiple bafiles.

Actually, observations of this device under test indicate that its success is derived more from its ability to reduce the pitch or wave frequencies than to absorb or eliminate the audible waves.

It is to be understood that while the invention is simple in design, the specific embodiment shown and described herein is a preferred embodiment only and minor changes may be made therein without departing from the spirit of the invention.

What I claim is:

1. An air cleaner and silencer consisting of a,

cylindrical upper chamber, a circular imperforate cover for said chamber, the side wall of said chamber being composed of air filtering material, a cylindrical lower chamber having a closed bota circular top opening approximating the full width of the lower chamber, and a lateral air outlet, an inwardly directed flange bordering top opening and supporting the side wall of the upper chamber, a straight cylindrical tube extending downwardly from approximately the midpoint of the upper chamber to the midpoint of the lower chamber, a dome-like partition with a port at its center, the peripheral edge of the partition resting on the flange beneath the side wall of the upper chamber, the portion of the partition around its center port being turned upwardly and being tangentially and supportingly fixed to the upper end of the cylindrical t e, and a retaining rod connected directly to closed bottom of the lower chamber and to the cover or" the upper chamber and extending therebetween through the cylindrical tube, the space between the cover and the closed bottom of the lower chamber being entirely free of intervening elements except for said partition, cylindrical tube and retaining rod.

2. An air cleaner and silencer consisting of a cylindrical upper chambena circular imperforate cover for said chamber, the side wall of said chamber being composed of air filtering material, a cylindrical lower chamber having a closed bottom, a circular top opening approximating the full width of the lower chamber, and a lateral air outlet, an inwardly directed flange bordering said top opening and supporting the side wall of the upper chamber, a straight cylindrical tube extending downwardly from approximately the midpoint of the upper chamber to approximately the midpoint of the lower chamber with its lower edge in line with the axis of the lateral air outlet, a dome-like partition with a port at its center, the peripheral edge of the partition resting on the flange beneath the side wall of the upper chamber, the portion of the partition around its center port being supportingly fixed to the upper end of the cylindrical tube, and a retaining rod connected directly to the closed bottom of the lower chamber and to the cover of the upper chamber and extending therebetween through the cylindrical tube.

JAMES E. PERRIN.

REFERENCES CITED lhe following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,934,463 Hartsock Nov. 7, 1933 2,126,643 Kamrath Aug. 9, 1938 2,340,152 Steensen Jan. 25, 1944 2,385,814 Kamrath Oct. 2, 1945 2,466,503 Stokes et a1 Apr. 5, 1949 

